/*
 * Copyright (c) Thorben Linneweber and others
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

using System.Collections.Generic;
using Jitter2.DataStructures;

using SoftFloat;

namespace Jitter2.Dynamics.Constraints
{
	
	public class Joint
	{
	    private readonly List<Constraint> constraints = new(4);
	    public ReadOnlyList<Constraint> Constraints => new ReadOnlyList<Constraint>(constraints);
	
	    /// <summary>
	    /// Add a constraint to the internal book keeping
	    /// </summary>
	    protected void Register(Constraint constraint) => constraints.Add(constraint);
	
	    /// <summary>
	    /// Remove a constraint from the internal book keeping
	    /// </summary>
	    protected void Deregister(Constraint constraint) => constraints.Remove(constraint);
	
	    /// <summary>
	    /// Enables all constraints that this joint is composed of.
	    /// </summary>
	    public void Enable()
	    {
	        foreach (var constraint in constraints)
	        {
	            if (constraint.Handle.IsZero) continue;
	            constraint.IsEnabled = true;
	        }
	    }
	
	    /// <summary>
	    /// Disables all constraints that this joint is composed of temporarily.
	    /// For a complete removal use <see cref="Joint.Remove()"/>.
	    /// </summary>
	    public void Disable()
	    {
	        foreach (var constraint in constraints)
	        {
	            if (constraint.Handle.IsZero) continue;
	            constraint.IsEnabled = false;
	        }
	    }
	
	    /// <summary>
	    /// Removes all constraints that this joint is composed of from the physics world.
	    /// </summary>
	    public void Remove()
	    {
	        foreach (var constraint in constraints)
	        {
	            if (constraint.Handle.IsZero) continue;
	            constraint.Body1.World.Remove(constraint);
	        }
	
	        constraints.Clear();
	    }
	}
}
